Michele
Encourage your father to go to an endochronologist and get his thyroid checked out! They can run tests and confirm the diagnosis and treat it. I found that with thyroid problems there are not always any set symptoms...my thyroid became toxic and I had all the symptoms of HYPOthyroidism, instead of HYPERthyroidism. I had my thyroid dstroyed by dinking a radiation iodine drink(very simple) and now take Levoxyl, a thyroid supplement, and feel great. Other syptoms were thining hair, insomnia, heart palpatations, shakiness and dry skin...everything is back to normal now!